So2sh dyes in dry heat dyeing

ABSTRACT

1 WATER-SOLUBLE THIOXULPHONIC PHTHALOCYANINE DYESTUFFS, THESE DYSESTUFFS ARE USEFUL IN DYEING CELLULOSIC FIBERS AND ARE PREPARED BY REACTING A COPPER PHTHALOCYANINE SULPHOCHLORIDE IN AQUEOUS MEDIUM AT A TEMPERATURE BETWEEN 0*C. AND 100*C. WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULPHIDES. ALKALI METAL HYDROSULPHIDES AND THIOUREA.

United States Patent Office 3,824,077 Patented July 16, 1974 3,824,077 SO SH DYES IN DRY HEAT DYEING David Razavi, Paris, France, assignor to Ugine Kuhlmann, Paris, France No Drawing. Application May 22, 1969, Ser. No. 828,441, which is a continuation of abandoned application Ser. No. 471,725, July 13, 1965. Divided and this application July 27, 1970, Ser. No. 58,744 Claims priority, application France, July 18, 1964, 982,217; July 22, 1964, 982,560 Int. Cl. D06p N30 US. Cl. 8--37 4 Claims ABSTRACT OF THE DISCLOSURE Water-soluble thiosulphonic phthalocyanine dyestuffs. These dyestuffs are useful in dyeing cellulosie fibres and are prepared by reacting a copper phthalocyanine sulphochloride in aqueous medium at a temperature between C. and 100 C. with a member selected from the group consisting of alkali metal sulphides, alkali metal hydrosulphides and thiourea.

This application is a divisional application of copending application Ser. No. 828,441 filed May 22, 1969, which, in turn is a streamlined continuation application of US. application Ser. No. 471,725 filed July 13, 1965, and now abandoned.

The present invention concerns new dyestuffs, methods for their preparation and their applications.

According to the present invention new dyestuffs are provided which are characterised by the presence in their molecules of at least one thiosulphonic group as the free acid or as a salt.

The thiosulphonic group has the formula SO SH and it can be introduced into the molecule of the dyestuff or of one of its intermediate products, for example, by the action of an alkali metal sulphide, an alkali metal hydrosulphide or thiourea on a sulphochloride of the dyestuff or one of its intermediate products.

It has been found according to the present invention that dyestuffs containing such a group are capable of being fixed on textile fibres, especially on fibres consisting of natural or regenerated cellulose, by a treatment at elevated temperature, thus providing with very good yields dyeings or printings which are remarkably fast to washing and to other wet tests.

The dyestuffs which may be used for carrying out the I invention may belong to very diverse classes, such as for example the following: azo, anthraquinone, azine, oxazlne, mtro, phthalocyanine, perinone, naphtholyene- 'imisazole, perylenetetracarbonimide, and quinacridone dyestuffs. They may be metallisable or metalliferous and contain metals such as copper, chromium, cobalt, nickel, manganese or iron; they may contain beside the thiosulphonic group other water-solubilising groups such as the -SO H, COOH, SO H or OSO H groups or reactive groups such as vinylsulphone, [i-chloroethylsulphonamido, 'y-chloro-fl-hydroxypropylsulphonamido, 2,6- dichloro 1,3,5 triazinyl, 2 chloro 1,3,5 triazinyl, 2,4 dichloro-pyrimidyl, 2,4,5 trichloropyrimidyl, 2- chloro-benzothiazyl, 1,4 dichloro-phthalazinyl, or 2,3- dichloro-quinoxalinyl groups.

The introduction of the sulphochloride group into a dyestuff may be effected according to the general known methods, such as sulphochlorination by chlorosulphonic acid; conversion of a sulphonic group into a sulphochloride group by the action of chlorosulphonic acid,,thionyl chloride, phosphorous pentachloride, phosphorus trichloride and chlorine or analogous reagents; or oxidation by chlorine of a disulphide g oup. This introduction may be made on the dyestuff itself or on an intermediate product such as a coupling compound, for example, which will subsequently be converted into dyestuff.

The conversion of the SO Cl group into a thiosulphonic group may be carried out, for example, with an aqueous solution of alkali metal sulphide or alkali metal hydrosulphide at a fairly low temperature, for example between 0 C. and C., preferably between 0 C., and 30 C., under conditions such that there is always a slight excess of sodium sulphide in the solution. In general, a stoichiometric quantity of sodium sulphide is sufficient to convert the AO cl into a 4O Na group; the latter is converted into the group -SO SH by acidification.

This conversion of the SO Cl group into a thiosulphonic group may also be effected by adding thiourea to an aqueous suspension of sulphochloride at a temperature between 0 C. and 100 C., preferably between 0 C. and 60 C., and neutralising the liberated hydrochloric acid by means of an alkali such as a solution of sodium hydroxide or carbonate. The sulphochloride which is generally insoluble in water at the beginning dissolves as the reaction progresses. The reaction period may vary from some minutes to some hours, the end of the reaction being generally able to be found :by the solubility of the conversion product obtained in water.

The dyestuffs according to the invention are stable at ordinary room temperature in aqueous slightly acid, alkaline or neutral medium, which enables them to be dried as the free acids, or as salts and their alkaline solution to 'be kept without deterioration. They may be applied to the fibres by dyeing, foularding or printing. For this purpose aqueous solutions or suspensions of these dyestuffs, possibly thickened, to which solvents, hydrotropes, wetting agents, dispersing agents, stabilisers, acid-absorbing agents or other auxiliary products may be added, are applied by the usual processes to the fibres, which may be of any form such as threads, fabrics, Wadding, bobbins, cakes. The addition of products yielding sulphur such as thiourea or thioacetamide, to the dye or foularding baths or to the printing pastes is especially advantageous. After drying, the material is then subjected to a heat treatment at a temperature between 100 C. and 220 C. During this treatment the dyestuff is fixed on the fibre with a high yield and, in numerous cases, almost quantitative yield, and thus provides colorations having excellent resistance to wet tests.

The following Examples, in which the parts are parts by weight unless the contrary is indicated, are purely illustrative and the invention is not limited thereto.

EXAMPLE 1 12 parts of copper phthalocyanine are added to 60 parts by volume of chlorosulphonic acid, with external cooling, then the mixture is heated to C. in a period of half an hour and maintained for 4 hours at a temperature of 135-140 C. It is then cooled to 60 C. and 20 parts by volume of thionyl chloride are added, the mixture is heated to 95 C. in a period of half an hour and maintained for one and a half hours at 9295 C. It is cooled, poured into 250 parts of a saturated salt solution and 500 parts of ice, and the solid is filtered off and the filter cake washed with ice water. This cake is suspended in 200 parts of ice water, the pH adjusted to neutrality at 0 C. by means of a 2N solution of sodium carbonate, and 35 parts of crystalline sodium sulphide are added. The temperature is maintained at between 0 C. and 10 C. for 40 minutes, and the product is acidified with hydrochloric acid until Congo red changes colour therein, and the solid is filtered off, washed with cold water and dried under vacuum at 50 C. A deep blue powder is obtained which dyes natural or regenerated cellulose, in the presence of an acid-absorbent and urea, giving on this fibre by heatfixing green shades which are very fast to wet tests. The fastness to washing may be improved further by adding thiourea to the foularding solution or to the printing paste of the dyestuif.

The application is effected, for example, in the following way. A foulardin-g bath is prepared containing one part of a dyestufi', parts of urea, 1.5 parts of thiourea, 15 parts of water. A cotton fabric is foularded in the bath so prepared, dried at 80 C. and fixed for 5 minutes at 150-160 C. in an unventilated enclosure or for 30 to 60 seconds at 180-200 C.

EXAMPLE 2 An aqueous suspension of copper phthalocyanine tetrasulphochloride obtained from 12 parts of copper phthalocyanine is treated with 5 parts of fl-chloroethylamine hydrochloride with stirring, at pH 7, first for one hour at ordinary room temperature, then by heating to 50 C. in a period of half an hour and maintaining at a temperature of 50-55 C. for 3 hours, at a neutral pH. The solid is filtered off and the filter cake is suspended in water at 0 C. 12 parts of crystalline sodium sulphide are added and the mixture is maintained for 30 minutes at a temperature between 0 C. and C. after which it is acidified, filtered and the solid dried at 50 C. A dyestutf is obtained which dyes cellulose fabrics according to the process indicated in Example 1 a bluish green. Analysis shows that the dyestufi contains six atoms of sulphur per molecule.

EXAMPLE 3 25 parts of the dyestutf of formula:

are added to 70 parts by volume of chlorosulphonic acid. The mixture is heated slowly to 7080 C. and this temperature is maintained until evolution of HCl ceases, which takes about two hours. 20 parts by volume of thionyl chloride are added in a period of 20 minutes, the mixture is heated to 98 C. and maintained for 2% hours at this temperature, and is then cooled, poured on to ice, and the solid filtered oflf and washed with ice water. The filter cake obtained is suspended in ice water, 60 parts of crystalline sodium sulphide are added, and the mixture is stirred for 40 minutes at a temperature from 0 C. to 10 C. The dyestufl? is precipitated with hydrochloric acid, filtered off and dried at 50 C. A dyestufi' is obtained which dyes cotton, according to the process indicated in Example 1, a navy blue shade fast to wet tests.

EXAMPLE 4 'Ilhe sulphochloride is prepared of the dyestufi of formu a:

"1) NH CH J) N H- CH;

The sulphochloride is prepared of the dyestuff of formula:

O NH- CH:

and it is treated with a solution of sodium sulphide, according to the process of Example 3. A dyestufi is obtained which dyes cellulose fabrics green.

EXAMPLE 6 25 parts of dyestutf of the formula:

are added to parts by volume of chlorosulphonic acid and the mixture is heated for four hours at a temperature of 70 C. to 75 C. 15 parts by volume of thionyl chloride are added, the mixture is heated and maintained for one and a half hours at this same temperature of 7075 C. It is cooled to the ambient temperature, poured on to ice, the solid filtered off and washed with ice water. The filter cake of the sulphochloride thus obtained is suspended in 200 parts of a mixture of water and ice, the pH is adjusted to 7, and 40 parts of crystalline sodium sulphide are added. The mixture is stirred for 30 minutes at between 0 C. and 7 C., acidified with hydrochloric acid, salted out with sodium chloride and the solid filtered 0E and dried at 50 C. A dyestufi. is obtained which dyes cellulose according to the process indicated in Example 1 a yellow shade fast to washing.

EXAMPLE 7 If the initial dyestutf used in the preceding Example is replaced by the dyestuff of the formula:

SOaH OH a red dyestulf is obtained which is fixed on cellulose in shades which are very fast to washing.

EXAMPLE 8 12 parts of copper phthalocyanine are added to 60 parts by volume of chlorosulphonic acid with external cooling, and the mixture is then heated to C. over a period of half an hour and maintained for 4 hours at a temperature of 135-l40 C. It is then cooled to 60 C., 20 parts by volume of thionyl chloride are added and the mixture is heated to 95 C. over a period of half an hour and maintained for one and a half hours at 95 C. It is cooled, poured into 250 parts of a saturated salt solution and 500 parts of ice, the solid filtered oh. and the filter cake washed with ice Water. This cake is suspended in 500 parts of water and ice, the pH is adjusted at C. to neutrality by means of a 2N solutions of sodium carbonate, and 15 parts of thiourea are added and the mixture is heated to 30-35" C. over a period of an hour while the hydrochloric acid evolved is neutralised at the same time by means of 2N sodium carbonate. In spite of the total solution of the dyestuff, stirring is continued and the temperature is raised to 40 C., for a quarter of an hour and it is found that the pH of the solution no longer alters. It is cooled to 8-10 C., acidified by means of acetic acid, salted out with sodium chloride, and the solid filtered off and dried at 50 C. A dyestuff is obtained as a deep blue powder which dissolves very readily in water.

The application of this dyestuif is made, for example, in the following way. A foularding bath is prepared containing one part of dyestuff, parts of urea, 1.5 parts of thiourea and 15 parts of water. A cotton fabric is foularded in the bath so prepared, and is dried at 80 and fixed for 5 minutes at 160 C. or for 1 minute at ZOO-220 C. After washing and soaping, a green shade which is very fast to wet tests is obtained with an almost quantitative yield.

EXAMPLE 9 25 parts of the dyestulf of the formula:

ANHC

are added to 70 parts by volume of chlorosulphonic acid, and the mixture is heated slowly to 7080 C. and maintained at this temperature until evolution of HCl has ceased, which requires about two hours. 20 parts by volume of thionyl chloride are added over a period of 20 minutes, and the mixture is heated to 98 0., maintained for 2 /2 hours at this temperature, cooled, poured to ice, and the solid filtered off and washed with ice water. The filter cake obtained is suspended in ice water, and 40 parts of thiourea are added, then the mixture is heated to 50 C. over a period of two hours while maintaining the pH at neutrality by means of 2N sodium carbonate. At the end of this time the dyestuif has dissolved in the water. The solution is maintained a further half hour at this temperature, then cooled and acidified with acetic acid. It is then salted out with sodium chloride, and the solid filtered off and dried. A deep blue powder is obtained which dyes cellulose fabrics, according to the process of Example 8, a navy blue shade fast to wet tests and with a very good yield.

EXAMPLE 10 25 parts of the dyestutf of the formula:

are added to 125 parts by volume of chlorosulphonic acid and the mixture is heated for four hours at a temperature of 70 C. to 75 C. parts by volume of thionyl chloride are added and the mixture is heated and maintained for 1 /2 hours at this same temperature of 7075 C. It is then cooled to the ambient temperature, poured on to ice, and the solid filtered off and washed with ice Water. The filter ca-ke of the sulphochloride thus obtained is suspended in 200 parts of a mixture of water and ice, the pH is adjusted to 7, and 20 parts of thiourea are added. The mixture is heated so that the temperature rises to 30-32 C. over a period of half an hour, while the pH of the solution is kept at neutrality by means of 2N sodium carbonate. At the end of this time the dyestuff becomes completely soluble in the water. The reaction mixture is heated for a further quarter of an hour at 35-40" C. and it is found that the pH of the solution no longer alters. It is cooled to 8-10 C. acidified with acetic acid and salted out with sodium chloride, and the solid is filtered off and dried at 50 C. A dyestuff is obtained which dyes cotton, according to the process of Example 8, a yellow shade which is very fast to wet tests.

EXAMPLE 11 20 parts of a condensation product of aminoazobenzene with aniline known by the name of Base of Induline B, are slowly introduced into 75 parts of volume of chlorosulphonic acid. The temperature is raised progressively to 125-135" C. and maintained at this level for 4 hours. The mixture is cooled to 50-60" C. and 40 parts by volume of thionyl chloride are added in 15 minutes. The temperature is raised to -98 C. and maintained at this for 3 hours. After cooling, the mass is poured onto a mixture of crushed ice and 250 parts by volume of a saturated salt solution so that the temperature does not exceed 0 C. The solid is filtered off and washed quickly with ice water, and is thoroughly drained.

The filter cake is made into a paste in 400 parts of water and crushed ice and 45 parts of thiourea are added. The pH of the mixture is adjusted to 6.56.9 by the addition of a solution of sodium carbonate, and the mixture is stirred at 0-5 C. for 6 hours while maintaining the pH in this region by the progressive introduction of a solution of sodium carbonate. When the pH no longer tends to fall, 300 parts of salt are added and the mixture is made acid by the addition of hydrochloric acid. The precipitate is filtered OE and drained. It is taken up in 400 parts of water and sodium carbonate is added until the pH is 7.8. The solution is brought to dryness by distillation under vacuum or by atomisation.

The product obtained is very soluble in water and when applied to the directions in Example 8, provides on cellulose fabric black shades which are very fast to wet tests and to light.

EXAMPLE 12 15 parts of the dyestutf of the formula:

CgHs

are slowly introduced into parts by volume of chlorosulphonic acid. The mixture is heated for 4 hours at 120430 C. cooled to 50 C., and 30 parts by volume of thionyl chloride are added and it is heated for 3 hours at 95-98 C. It is allowed to cool and poured on 250 parts by volume of a saturated salt solution containing crushed ice in order that 0 C. is not exceeded. The solid is filtered olf, washed with ice water and thoroughly drained. The filter cake is made into a paste in 300 parts of water and crushed ice, 40 parts of thiourea are added, and the mixture is stirred for 2 /2 hours while maintaining the temperature between 0 C. and 5 C. and adjusting the pH to a value between 6.3 and 6.5 by the addition of a solution of sodium carbonate. After stirring for 16 hours, the final pH is 7.3, and sodium chloride is added until the 7 dyestufi is almost completely precipitated. The precipitate is filtered 01f, drained and dried at 50 C.

The dyestutf obtained dyes cotton, under the conditions described in Example 8, in violet blue shades having excellent fastness to light and to wet tests.

I claim:

1. A process for coloring textile fibers which comprises impregnating the fibers with an aqueous solution of a dyestuflE containing at least one member selected from the group consisting of the free (SO SH), and salts thereof and subjecting the fibers thus impregnated to an anhydrous treatment at a temperature between 100 C. and 220 C.

2. A process for coloring textile fibers which comprises impregnating the fibers with an aqueous solution of a dyestuflf containing at least one member selected from the group consisting of the thiosulphonic acid group (-SOzSH) and salts thereof, said solution containing a generator of sulphur, and subjecting the fibers thus impregnated to an anhydrous heat treatment at a temperature between 100 C. and 220 C.

3. A process for coloring textile fibers which comprises impregnatin g the fibers with an aqueous solution of a dyestuif containing at least one member selected from the group consisting of the free thiosulphonic acid group and salts thereof, said solution containing thiourea, and subjecting the fibers thus impregnated to an anhydrous heat treatment at a temperature between C. and 220 C.

4. A process for coloring cellulose textile fibers which comprises impregnating the fibers with an aqueous solution of a dyestutf containing at least one member selected from the group consisting of the free thiosulphonic acid group (-SO SH) and salts thereo and subjecting the fibers thus impregnated to an anhydrous heat treatment at a temperature between 100 C. and 220 C.

References Cited UNITED STATES PATENTS 2,063,147 12/ 1936 Berthold -870 3,113,824 12/1963 Kohl 837 2,416,387 2/1947 Haddock 26U314.5 3,387,913 6/1968 Tigler 8-37 3,294,476 12/1966 Kruschke 837 3,420,615 1/ 1969 Grifiith 8-37 3,547,957 12/1970 Razavi 260374 3,378,568 4/1968 Bryan et al 837 X DONALD LEVY, Primary Examiner U.S. Cl. X.R. 839, 41 R, lXA

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION I Patent No. 3,824,077 Dated Julv L6, 1974 Inventor(s) David Vi It is certified'that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 1, line 4, after "free" insert thiosulfonic acid group Claim 4, line 5, ".thereo"-should read thereof Signed and sealed this 8th day of October 1974.-

(SEAL) Attest:

McCOY M. GIBSON JR. v c. MARSHALL Attesting Officer 7 7 Commissioner of Patents FORM PO-1050 (10-69) v USCOMM DC 6376 p9 u. covzurmim PRINTING orncz: 930 

